[84porsche]

I am not sure how accurate this is but its very possible that the Porsche 980 was the project number for the CGT.

http://www.fantasycars.com/1/News/700hp_Porsche_980_to_be_Unveil/700hp_porsche_980_to_be_unveil.html

Of course, some changes between this and the actually CGT have occured. This I believe was the prototype.